Do you know how many functions there are in base R?
How many of them do you know you don't know?
Run unk() to discover your unknown unknowns.
It's fast and it's fun!
unknownR v0.2 is now on CRAN.
More information is on the homepage :
http://unknownr.r-forge.r-project.org/
Or, just install the package and try it :
install.packages("unknownR")
library(unknownR)
?unk
unk()
learn()
Matthew